I'm trying to remove the DVD drive from my Acer TravelMate 6592G, but it has two lock 'switches', one of which seems stuck. I'm very nervous about pushing it any harder, as I know too well how easily plastic casings etc. break. Is there anything I can do to help free it?

Bonus points: I would actually like to open up the whole machine, but it seems this is stopping the back/bottom cover from coming lose. After removing all screws, including those inside battery and memory bays, is there anything else I should do?